When playing those naming games and pub quizzes, nobody ever mentions Sweyn Forkbeard. Okay, so he was England's shortest-reigning king but he was declared King of England, on Christmas day 1013.
However, he was pivotal to the development of English history. His legacy was in Canute who became known in some quarters as 'the great' when he became king of England, Denmark and Norway. Viking DNA is now part of our royal bloodline as well as the rest of us English folk.
Sweyn reigned for just forty days. He died on 3 February 1014 in Gainsborough, Lincolnshire. He was killed but there are no records of a body nor a grave. So what happened to him?
One popular theory is he was murdered by the ghost of St Edmund, who was himself killed by Sweyn's Viking predecessors. It is said that he returned from the grave in the dead of night during Candlemass and took his revenge with a spear.
Who knows? Just remember that he was England's shortest-reigning king, in case it comes up in the pub quiz.